#3 Managing Veterans and rookies
Roles of wrestlers have to be understood well in order to execute them to their full potential. WWE has quite a liking for part-timers and Legends of days gone by. Guys such as Goldberg went over young and talented guys such as Kevin Owens, for nothing but a cheap nostalgia trip, while TNA has been a 'retirement home' for departed WWE stars.
On the other hand, NJPW uses their legends perfectly, by not putting them in a high stakes match or a match that will make them look bad. NJPW veterans like Jushin Liger, Hiroyoshi Tenzan, Kojima are often seen in tag matches and undercard bouts. This keeps them relevant, and at the same time, grants the audience a trip down nostalgia lane.
The same goes for the rookies; Fandango defeated Chris Jericho at the Grandest Stage of Them All, but he's now a comedy act due to poor booking. But guys such as Jay White battled Tanahashi and then went on to win the US Championship from Kenny Omega.